Police riot squads have been pelted with rocks and bottles outside Kalgoorlie Courthouse, which has been forced into lockdown as tensions boil over after the alleged manslaughter of a 14-year-old indigenous boy.Teenager Elijah Doughty died on Monday morning after the scooter he was riding, which was reported stolen on Sunday and was linked to the accused, was involved in a crash with the 55-year-old accused’s Nissan Navara.